crimson/osd/pg: clear backfill_state when the PG goes clean

Fixes: https://tracker.ceph.com/issues/67731
Signed-off-by: Xuehan Xu <[email protected]>

Author: xxhdx1985126

src/crimson/osd/pg.cc

@@ -513,6 +513,7 @@ PG::do_delete_work(ceph::os::Transaction &t, ghobject_t _next)
 
 Context *PG::on_clean()
 {
+  recovery_handler->on_pg_clean();
   scrubber.on_primary_active_clean();
   return nullptr;
 }

src/crimson/osd/pg_recovery.cc

@@ -603,9 +603,13 @@ bool PGRecovery::budget_available() const
   return true;
 }
 
-void PGRecovery::backfilled()
+void PGRecovery::on_pg_clean()
 {
   backfill_state.reset();
+}
+
+void PGRecovery::backfilled()
+{
   using LocalPeeringEvent = crimson::osd::LocalPeeringEvent;
   std::ignore = pg->get_shard_services().start_operation<LocalPeeringEvent>(
     static_cast<crimson::osd::PG*>(pg),

src/crimson/osd/pg_recovery.h

@@ -41,6 +41,7 @@ class PGRecovery : public crimson::osd::BackfillState::BackfillListener {
   }
 
   seastar::future<> stop() { return seastar::now(); }
+  void on_pg_clean();
 private:
   PGRecoveryListener* pg;
   size_t start_primary_recovery_ops(